A Study of Pegasys (Peginterferon Alfa-2a) Administered Alone or in Combination With Copegus (Ribavirin) in Patients With Chronic Hepatitis C Who Have Participated in Previous Pegasys Trials
Conditions
Interventions
- DRUG: Peginterferon alfa-2a
- DRUG: Ribavirin
Sponsor
Hoffmann-La Roche